package org.bouncycastle.asn1;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

public abstract class ASN1Encodable implements DEREncodable {
    public static final String DER = "DER";
    public static final String BER = "BER";

    public byte[] getEncoded() throws IOException {
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        ASN1OutputStream aOut = new ASN1OutputStream(bOut);

        aOut.writeObject(this);

        return bOut.toByteArray();
    }

    public byte[] getEncoded(String encoding) throws IOException {
        if (encoding.equals(DER)) {
            ByteArrayOutputStream bOut = new ByteArrayOutputStream();
            DEROutputStream dOut = new DEROutputStream(bOut);

            dOut.writeObject(this);

            return bOut.toByteArray();
        }

        return this.getEncoded();
    }

    /**
     * Return the DER encoding of the object, null if the DER encoding can not be made.
     * 
     * @return a DER byte array, null otherwise.
     */
    public byte[] getDEREncoded() {
        try {
            return this.getEncoded(DER);
        } catch (IOException e) {
            return null;
        }
    }

    public int hashCode() {
        return this.toASN1Object().hashCode();
    }

    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (!(o instanceof DEREncodable)) {
            return false;
        }

        DEREncodable other = (DEREncodable) o;

        return this.toASN1Object().equals(other.getDERObject());
    }

    public DERObject getDERObject() {
        return this.toASN1Object();
    }

    public abstract DERObject toASN1Object();
}
